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add option to bypass quick returns in integer theory integration in theory_str

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this might not actually be that useful, if the problem is, as I suspect it to be,
that values we get from the integer theory need not correspond with
assertions in the core (that can get popped off the stack, etc.)
This commit is contained in:
Murphy Berzish 2016-07-23 22:43:46 -04:00
parent ac16aa7c81
commit 02a66c425e
2 changed files with 196 additions and 25 deletions
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212
src/smt/theory_str.cpp
View file

@ -33,6 +33,7 @@ theory_str::theory_str(ast_manager & m):
opt_EagerStringConstantLengthAssertions(true),
opt_VerifyFinalCheckProgress(true),
opt_LCMUnrollStep(2),
opt_NoQuickReturn_Concat_IntegerTheory(true),
/* Internal setup */
search_started(false),
m_autil(m),
@ -145,7 +146,7 @@ void theory_str::assert_axiom(expr * e) {
// crash/error avoidance: add all axioms to the trail
m_trail.push_back(e);
TRACE("t_str_detail", tout << "done asserting " << mk_ismt2_pp(e, get_manager()) << std::endl;);
//TRACE("t_str_detail", tout << "done asserting " << mk_ismt2_pp(e, get_manager()) << std::endl;);
}
void theory_str::assert_implication(expr * premise, expr * conclusion) {
@ -2049,8 +2050,16 @@ void theory_str::simplify_concat_equality(expr * nn1, expr * nn2) {
TRACE("t_str", tout << "nn1 = " << mk_ismt2_pp(nn1, m) << std::endl
<< "nn2 = " << mk_ismt2_pp(nn2, m) << std::endl;);
TRACE("t_str_detail", tout
<< "len(" << mk_pp(a1_arg0, m) << ") = " << (a1_arg0_len_exists ? a1_arg0_len.to_string() : "?") << std::endl
<< "len(" << mk_pp(a1_arg1, m) << ") = " << (a1_arg1_len_exists ? a1_arg1_len.to_string() : "?") << std::endl
<< "len(" << mk_pp(a2_arg0, m) << ") = " << (a2_arg0_len_exists ? a2_arg0_len.to_string() : "?") << std::endl
<< "len(" << mk_pp(a2_arg1, m) << ") = " << (a2_arg1_len_exists ? a2_arg1_len.to_string() : "?") << std::endl
<< std::endl;);
infer_len_concat_equality(nn1, nn2);
// TODO we may want to add no-quick-return options for these as well
if (a1_arg0 == a2_arg0) {
if (!in_same_eqc(a1_arg1, a2_arg1)) {
expr_ref premise(ctx.mk_eq_atom(nn1, nn2), m);
@ -2077,6 +2086,8 @@ void theory_str::simplify_concat_equality(expr * nn1, expr * nn2) {
// quick path
// TODO we may want to add no-quick-return options for these as well
if (in_same_eqc(a1_arg0, a2_arg0)) {
if (in_same_eqc(a1_arg1, a2_arg1)) {
TRACE("t_str_detail", tout << "SKIP: a1_arg0 =~ a2_arg0 and a1_arg1 =~ a2_arg1" << std::endl;);
@ -2111,7 +2122,12 @@ void theory_str::simplify_concat_equality(expr * nn1, expr * nn2) {
expr_ref conclusion(m.mk_and(ax_r1, ax_r2), m);
assert_implication(premise, conclusion);
return;
if (opt_NoQuickReturn_Concat_IntegerTheory) {
TRACE("t_str_detail", tout << "bypassing quick return from the end of this case" << std::endl;);
} else {
return;
}
}
}
@ -2127,7 +2143,11 @@ void theory_str::simplify_concat_equality(expr * nn1, expr * nn2) {
expr_ref conclusion(m.mk_and(ax_r1, ax_r2), m);
assert_implication(premise, conclusion);
return;
if (opt_NoQuickReturn_Concat_IntegerTheory) {
TRACE("t_str_detail", tout << "bypassing quick return from the end of this case" << std::endl;);
} else {
return;
}
}
}
@ -2328,7 +2348,42 @@ void theory_str::process_concat_eq_type1(expr * concatAst1, expr * concatAst2) {
std::pair<expr*, expr*> key1(concatAst1, concatAst2);
std::pair<expr*, expr*> key2(concatAst2, concatAst1);
if (varForBreakConcat.find(key1) == varForBreakConcat.end() && varForBreakConcat.find(key2) == varForBreakConcat.end()) {
// check the entries in this map to make sure they're still in scope
// before we use them.
std::map<std::pair<expr*,expr*>, std::map<int, expr*> >::iterator entry1 = varForBreakConcat.find(key1);
std::map<std::pair<expr*,expr*>, std::map<int, expr*> >::iterator entry2 = varForBreakConcat.find(key2);
bool entry1InScope;
if (entry1 == varForBreakConcat.end()) {
entry1InScope = false;
} else {
if (internal_variable_set.find((entry1->second)[0]) == internal_variable_set.end()
|| internal_variable_set.find((entry1->second)[1]) == internal_variable_set.end()
|| internal_variable_set.find((entry1->second)[2]) == internal_variable_set.end()) {
entry1InScope = false;
} else {
entry1InScope = true;
}
}
bool entry2InScope;
if (entry2 == varForBreakConcat.end()) {
entry2InScope = false;
} else {
if (internal_variable_set.find((entry2->second)[0]) == internal_variable_set.end()
|| internal_variable_set.find((entry2->second)[1]) == internal_variable_set.end()
|| internal_variable_set.find((entry2->second)[2]) == internal_variable_set.end()) {
entry2InScope = false;
} else {
entry2InScope = true;
}
}
TRACE("t_str_detail", tout << "entry 1 " << (entry1InScope ? "in scope" : "not in scope") << std::endl
<< "entry 2 " << (entry2InScope ? "in scope" : "not in scope") << std::endl;);
if (!entry1InScope && !entry2InScope) {
t1 = mk_nonempty_str_var();
t2 = mk_nonempty_str_var();
xorFlag = mk_internal_xor_var();
@ -2339,7 +2394,7 @@ void theory_str::process_concat_eq_type1(expr * concatAst1, expr * concatAst2) {
varForBreakConcat[key1][2] = xorFlag;
} else {
// match found
if (varForBreakConcat.find(key1) != varForBreakConcat.end()) {
if (entry1InScope) {
t1 = varForBreakConcat[key1][0];
t2 = varForBreakConcat[key1][1];
xorFlag = varForBreakConcat[key1][2];
@ -2619,17 +2674,50 @@ void theory_str::process_concat_eq_type2(expr * concatAst1, expr * concatAst2) {
std::pair<expr*, expr*> key1(concatAst1, concatAst2);
std::pair<expr*, expr*> key2(concatAst2, concatAst1);
if (varForBreakConcat.find(key1) == varForBreakConcat.end()
&& varForBreakConcat.find(key2) == varForBreakConcat.end()) {
// check the entries in this map to make sure they're still in scope
// before we use them.
std::map<std::pair<expr*,expr*>, std::map<int, expr*> >::iterator entry1 = varForBreakConcat.find(key1);
std::map<std::pair<expr*,expr*>, std::map<int, expr*> >::iterator entry2 = varForBreakConcat.find(key2);
bool entry1InScope;
if (entry1 == varForBreakConcat.end()) {
entry1InScope = false;
} else {
if (internal_variable_set.find((entry1->second)[0]) == internal_variable_set.end()
|| internal_variable_set.find((entry1->second)[1]) == internal_variable_set.end()) {
entry1InScope = false;
} else {
entry1InScope = true;
}
}
bool entry2InScope;
if (entry2 == varForBreakConcat.end()) {
entry2InScope = false;
} else {
if (internal_variable_set.find((entry2->second)[0]) == internal_variable_set.end()
|| internal_variable_set.find((entry2->second)[1]) == internal_variable_set.end()) {
entry2InScope = false;
} else {
entry2InScope = true;
}
}
TRACE("t_str_detail", tout << "entry 1 " << (entry1InScope ? "in scope" : "not in scope") << std::endl
<< "entry 2 " << (entry2InScope ? "in scope" : "not in scope") << std::endl;);
if (!entry1InScope && !entry2InScope) {
temp1 = mk_nonempty_str_var();
xorFlag = mk_internal_xor_var();
varForBreakConcat[key1][0] = temp1;
varForBreakConcat[key1][1] = xorFlag;
} else {
if (varForBreakConcat.find(key1) != varForBreakConcat.end()) {
if (entry1InScope) {
temp1 = varForBreakConcat[key1][0];
xorFlag = varForBreakConcat[key1][1];
} else if (varForBreakConcat.find(key2) != varForBreakConcat.end()) {
} else if (entry2InScope) {
temp1 = varForBreakConcat[key2][0];
xorFlag = varForBreakConcat[key2][1];
}
@ -2888,7 +2976,6 @@ void theory_str::process_concat_eq_type3(expr * concatAst1, expr * concatAst2) {
std::string strValue = m_strutil.get_string_constant_value(strAst);
// TODO integer theory interaction
rational x_len, y_len, str_len, n_len;
bool x_len_exists = get_len_value(x, x_len);
bool y_len_exists = get_len_value(y, y_len);
@ -2899,14 +2986,49 @@ void theory_str::process_concat_eq_type3(expr * concatAst1, expr * concatAst2) {
expr_ref temp1(mgr);
std::pair<expr*, expr*> key1(concatAst1, concatAst2);
std::pair<expr*, expr*> key2(concatAst2, concatAst1);
if (varForBreakConcat.find(key1) == varForBreakConcat.end() && varForBreakConcat.find(key2) == varForBreakConcat.end()) {
// check the entries in this map to make sure they're still in scope
// before we use them.
std::map<std::pair<expr*,expr*>, std::map<int, expr*> >::iterator entry1 = varForBreakConcat.find(key1);
std::map<std::pair<expr*,expr*>, std::map<int, expr*> >::iterator entry2 = varForBreakConcat.find(key2);
bool entry1InScope;
if (entry1 == varForBreakConcat.end()) {
entry1InScope = false;
} else {
if (internal_variable_set.find((entry1->second)[0]) == internal_variable_set.end()
|| internal_variable_set.find((entry1->second)[1]) == internal_variable_set.end()) {
entry1InScope = false;
} else {
entry1InScope = true;
}
}
bool entry2InScope;
if (entry2 == varForBreakConcat.end()) {
entry2InScope = false;
} else {
if (internal_variable_set.find((entry2->second)[0]) == internal_variable_set.end()
|| internal_variable_set.find((entry2->second)[1]) == internal_variable_set.end()) {
entry2InScope = false;
} else {
entry2InScope = true;
}
}
TRACE("t_str_detail", tout << "entry 1 " << (entry1InScope ? "in scope" : "not in scope") << std::endl
<< "entry 2 " << (entry2InScope ? "in scope" : "not in scope") << std::endl;);
if (!entry1InScope && !entry2InScope) {
temp1 = mk_nonempty_str_var();
xorFlag = mk_internal_xor_var();
varForBreakConcat[key1][0] = temp1;
varForBreakConcat[key1][1] = xorFlag;
} else {
if (varForBreakConcat.find(key1) != varForBreakConcat.end()) {
if (entry1InScope) {
temp1 = varForBreakConcat[key1][0];
xorFlag = varForBreakConcat[key1][1];
} else if (varForBreakConcat.find(key2) != varForBreakConcat.end()) {
@ -3366,7 +3488,6 @@ void theory_str::process_concat_eq_type6(expr * concatAst1, expr * concatAst2) {
// check the entries in this map to make sure they're still in scope
// before we use them.
// TODO something very similar might have to be done elsewhere when we use this map, if this works.
std::map<std::pair<expr*,expr*>, std::map<int, expr*> >::iterator entry1 = varForBreakConcat.find(key1);
std::map<std::pair<expr*,expr*>, std::map<int, expr*> >::iterator entry2 = varForBreakConcat.find(key2);
@ -4084,16 +4205,44 @@ void theory_str::solve_concat_eq_str(expr * concat, expr * str) {
expr_ref xorFlag(m);
std::pair<expr*, expr*> key1(arg1, arg2);
std::pair<expr*, expr*> key2(arg2, arg1);
std::map<std::pair<expr*, expr*>, std::map<int, expr*> >::iterator varBreak_key1 =
varForBreakConcat.find(key1);
std::map<std::pair<expr*, expr*>, std::map<int, expr*> >::iterator varBreak_key2 =
varForBreakConcat.find(key2);
if (varBreak_key1 == varForBreakConcat.end() && varBreak_key2 == varForBreakConcat.end()) {
// check the entries in this map to make sure they're still in scope
// before we use them.
std::map<std::pair<expr*,expr*>, std::map<int, expr*> >::iterator entry1 = varForBreakConcat.find(key1);
std::map<std::pair<expr*,expr*>, std::map<int, expr*> >::iterator entry2 = varForBreakConcat.find(key2);
bool entry1InScope;
if (entry1 == varForBreakConcat.end()) {
entry1InScope = false;
} else {
if (internal_variable_set.find((entry1->second)[0]) == internal_variable_set.end()) {
entry1InScope = false;
} else {
entry1InScope = true;
}
}
bool entry2InScope;
if (entry2 == varForBreakConcat.end()) {
entry2InScope = false;
} else {
if (internal_variable_set.find((entry2->second)[0]) == internal_variable_set.end()) {
entry2InScope = false;
} else {
entry2InScope = true;
}
}
TRACE("t_str_detail", tout << "entry 1 " << (entry1InScope ? "in scope" : "not in scope") << std::endl
<< "entry 2 " << (entry2InScope ? "in scope" : "not in scope") << std::endl;);
if (!entry1InScope && !entry2InScope) {
xorFlag = mk_internal_xor_var();
varForBreakConcat[key1][0] = xorFlag;
} else if (varBreak_key1 != varForBreakConcat.end()) {
} else if (entry1InScope) {
xorFlag = varForBreakConcat[key1][0];
} else { // varBreak_key2 != varForBreakConcat.end()
} else { // entry2InScope
xorFlag = varForBreakConcat[key2][0];
}
@ -4632,7 +4781,7 @@ void theory_str::push_scope_eh() {
context & ctx = get_context();
sLevel += 1;
TRACE("t_str", tout << "push to " << sLevel << std::endl;);
TRACE("t_str_dump_assign", dump_assignments(););
TRACE("t_str_dump_assign_on_scope_change", dump_assignments(););
}
void theory_str::pop_scope_eh(unsigned num_scopes) {
@ -4683,7 +4832,7 @@ void theory_str::dump_assignments() {
ctx.get_assignments(assignments);
for (expr_ref_vector::iterator i = assignments.begin(); i != assignments.end(); ++i) {
expr * ex = *i;
tout << mk_ismt2_pp(ex, m) << std::endl;
tout << mk_ismt2_pp(ex, m) << (ctx.is_relevant(ex) ? "" : " (NOT REL)") << std::endl;
}
);
}
@ -4697,6 +4846,9 @@ void theory_str::classify_ast_by_type(expr * node, std::map<expr*, int> & varMap
if (variable_set.find(node) != variable_set.end()
&& internal_lenTest_vars.find(node) == internal_lenTest_vars.end()
&& internal_valTest_vars.find(node) == internal_valTest_vars.end()) {
if (varMap[node] != 1) {
TRACE("t_str_detail", tout << "new variable: " << mk_pp(node, get_manager()) << std::endl;);
}
varMap[node] = 1;
}
// check whether the node is a function that we want to inspect
@ -4755,6 +4907,10 @@ void theory_str::classify_ast_by_type_in_positive_context(std::map<expr*, int> &
// so we bypass a huge amount of work by doing the following...
if (m.is_eq(argAst)) {
TRACE("t_str_detail", tout
<< "eq ast " << mk_pp(argAst, m) << " is between args of sort "
<< m.get_sort(to_app(argAst)->get_arg(0))->get_name()
<< std::endl;);
classify_ast_by_type(argAst, varMap, concatMap, unrollMap);
}
}
@ -4976,6 +5132,7 @@ int theory_str::ctx_dep_analysis(std::map<expr*, int> & strVarMap, std::map<expr
for(std::set<expr*>::iterator it = variable_set.begin(); it != variable_set.end(); ++it) {
expr* var = *it;
if (internal_variable_set.find(var) == internal_variable_set.end()) {
TRACE("t_str_detail", tout << "new variable: " << mk_pp(var, m) << std::endl;);
strVarMap[*it] = 1;
}
}
@ -5716,7 +5873,7 @@ final_check_status theory_str::final_check_eh() {
constValue = NULL;
{
TRACE("t_str_detail", tout << "free var map (# " << freeVar_map.size() << "):" << std::endl;
TRACE("t_str_detail", tout << "free var map (#" << freeVar_map.size() << "):" << std::endl;
for (std::map<expr*, int>::iterator freeVarItor1 = freeVar_map.begin(); freeVarItor1 != freeVar_map.end(); freeVarItor1++) {
expr * freeVar = freeVarItor1->first;
rational lenValue;
@ -5764,7 +5921,7 @@ final_check_status theory_str::final_check_eh() {
// experimental free variable assignment - end
// now deal with removed free variables that are bounded by an unroll
TRACE("t_str", tout << "fv_unrolls_map (#" << fv_unrolls_map.size() << ")" << std::endl;);
TRACE("t_str", tout << "fv_unrolls_map (#" << fv_unrolls_map.size() << "):" << std::endl;);
for (std::map<expr*, std::set<expr*> >::iterator fvIt1 = fv_unrolls_map.begin();
fvIt1 != fv_unrolls_map.end(); fvIt1++) {
expr * var = fvIt1->first;
@ -6004,7 +6161,6 @@ expr * theory_str::gen_free_var_options(expr * freeVar, expr * len_indicator,
int len = atoi(len_valueStr.c_str());
// check whether any value tester is actually in scope
// TODO NEXT we need to do this check for other tester variables that could potentially go out of scope
TRACE("t_str_detail", tout << "checking scope of previous value testers" << std::endl;);
bool map_effectively_empty = true;
if (fvar_valueTester_map[freeVar].find(len) != fvar_valueTester_map[freeVar].end()) {
@ -6042,6 +6198,12 @@ expr * theory_str::gen_free_var_options(expr * freeVar, expr * len_indicator,
for (; i < testerTotal; i++) {
expr * aTester = fvar_valueTester_map[freeVar][len][i].second;
// it's probably worth checking scope here, actually
if (internal_variable_set.find(aTester) == internal_variable_set.end()) {
TRACE("t_str_detail", tout << "value tester " << mk_pp(aTester, m) << " out of scope, skipping" << std::endl;);
continue;
}
if (aTester == valTesterInCbEq) {
break;
}

9
src/smt/theory_str.h
View file

@ -94,6 +94,15 @@ namespace smt {
*/
int opt_LCMUnrollStep;
/*
* If NoQuickReturn_Concat_IntegerTheory is set to true,
* the integer theory integration conditionals in simplify_concat_equality()
* will not return from the function after asserting their axioms.
* This means that control will fall through to the type 1-6 axioms,
* causing those to be added as well.
*/
bool opt_NoQuickReturn_Concat_IntegerTheory;
bool search_started;
arith_util m_autil;
str_util m_strutil;